diff --git a/due_obd2/obd2_bt.h b/due_obd2/obd2_bt.h
index e851273..e5a335a 100644
--- a/due_obd2/obd2_bt.h
+++ b/due_obd2/obd2_bt.h
@@ -45,14 +45,38 @@ enum BluetoothState
     BT_CONNECTED = 2
 };
 
+/**
+ * @brief struct to hold bluetooth module data
+ * 
+ * @param state the current state of the bluetooth module
+ * @param on_state_change function pointer to the function to be called when the state changes
+ */
 typedef struct obt2_bt_tag
 {
     enum BluetoothState state;
     void (*on_state_change)();
 } obd2_bt_t;
 
+/**
+ * @brief initializes the bluetooth module driver   
+ * 
+ * @param bt pointer to struct holding bluetooth driver data
+ */
 void obd2_bt_init(obd2_bt_t *bt);
+
+/**
+ * @brief processes the bluetooth module communication with the OBD2 reader
+ * 
+ * @param bt pointer to struct holding bluetooth driver data
+ */
 void obd2_bt_process(obd2_bt_t *bt);
+
+/**
+ * @brief copies the current state of the bluetooth module to the state string
+ * 
+ * @param bt pointer to struct holding bluetooth driver data
+ * @param state resulting string to hold the text representation of the state
+ */
 void obd2_bt_get_state(obd2_bt_t *bt, char *state);
 
 #ifdef __cplusplus